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Full text of "Alaskan glacier studies of the National Geographic Society in the Yakutat Bay, Prince William Sound and lower Copper River regions"

418
ALASKAN GLACIER STUDIES
and damming back the river as already described. The fact that the river has cut only part way through the moraine indicated a very recent recession of the glacier."
Although no reference is made to ice beneath the moraine, there can be no doubt that it was there in 1891, as it was in 1909.
Abercrombie revisited Miles Glacier and Abercrombie Rapids in October, 1898, fourteen years after his first visit, and states that "the glacier is very much emaciated, and the channels through which the water rushes are much wider. The current, while less violent, is still of such a character as to preclude any thought of navigation under any condition. Shooting the first and second rapids successfully the little party dropped down through the third and proceeded down the river past Childs Glacier. On the
lOmiles
FIG. 61.   LOTVEB PORTION OF MILES GLACEEB IN 1906. After U. S. GeoL Survey.
faces of both Childs and Miles glaciers I noticed a very marked change. Miles Glacier had receded toward Mt. St. Elias some 5 or 6 miles. Where in 1884 the Copper washed the face of this glacier was now an immense lake.1
He further states that at the head of Abercrombie Rapids, Miles Glacier is "covered with an immense amount of morainic matter and a dense growth of alders, which effectively protect the glacier proper from inroads by the river." What has since been named Abercrombie Canyon "has a canyon wall on the right side only. The left is formed by the encroachment of Miles Glacier." The rapids are "known, respectively, as the first, second, third, and fourth rapids. When I first visited this canyon, in 1884, there was but one rapid, the first. On my return this season the emaciation of the
ğAbercrombie. W. R., Reports of Explorations in the Territory of Alaska, 1808, War Dept., Adj.-Gen. Office, No. XXV, Washington, 1899, pp. 315, S£0-S22; Koehler, R. A., Same, p. 431; Rafferty, J. J., Same, pp. 449-450; also in Narratives of Explorations in Alaska, Washington, 1900.